Too much/big for 20H?

no way is that too big. In fact, you do NOT want to get a skimmer thats only rated to the size of your tank (example...dont get a skimmer rated to 65 gallons and actually put it on a 65 gallon tank...not gonna be good enough) Because skimmers are all over rated. That particular skimmer is one of the prefered skimmers on tanks up to like 40 gallons (and 20 gallons being a very commonly used tank w/that skimmer)

It will be great imo ;)
 
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